1. Melt index affects the strength of polypropylene fiber

Under the same spinning temperature, the same draw ratio and the same process parameters, the lower the melt index of the polypropylene chip, the higher the strength of the polypropylene fiber.

All in all, at a certain spinning temperature, when the melt index of the raw material is low, higher strength can be achieved under the condition of a lower draw ratio. If the melt index of the raw material is higher, greater stretching is required. The multiple can reach a certain strength.

Polypropylene fiber has a maximum strength of 7.0～7.9cN/dtex, and it has a wide range of uses: filter cloth, geotextile, sling, conveyor belt, etc.

2. The stretching ratio affects the strength of polypropylene fiber

As the stretching ratio increases, the strength of the fiber increases, which has a greater impact on the strength of the fiber.

3. Stretching speed, stretching speed, the strength of polypropylene yarn

In the one-step polypropylene filament spinning line, the drawing speed is approximately equal to the spinning speed. The orientation and crystallinity of the fiber are not only affected by the stretching ratio, but also by the stretching speed.

Different drawing speeds, that is, different spinning speeds, have different fiber strengths. The strength of polypropylene filaments decreases as the drawing speed increases.

For the same kind of raw material, the stretching ratio, spinning speed, spinning temperature, steel blowing temperature and wind speed can be adjusted to make the finished product reach the required strength. Through reasonable coordination of process parameters, polypropylene yarn with high strength and good quality can be produced.